SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'faa27ec672d48db314a258568b6feda50ff87ed76e5a06ffc35ef9d68c503307' 
  AND token = 'swViH2t9cz/B49Va3zIrDjuiJxgOL9Rx0huZUBbhZXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}